Aerith from Final Fantasy VII?
For all the crap the game gets, Johnny Silverhand in Cyberpunk was actually an incredibly written companion character. Plus bonus points because of Keanu Reeves.
Kainé from NieR Gestalt/Replicant?
KOSMOS from XenoSaga?
Geno from Super Mario RPG?
Karlach from BG3?
Heck, even Serana from Skyrim could be there.
Many characters I would consider at the very least to be contenders for top spot, if not outright surpassing Morrigan.